AD7719BR-REEL7 - 24-Bit Dual Sigma-Delta ADC AFE | Analog Devices
MPN: AD7719BR-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.05 | $130.50 |
| 100 | $11.5 | $1,150.00 |
| 500 | $10.21 | $5,105.00 |
| 1,000 | $9.12 | $9,120.00 |
AD7719BR-REEL7 Overview
A Σ-Δ (Sigma-Delta) analog-to-digital converter is a type of ADC that uses oversampling and noise shaping to achieve very high resolution at low bandwidths, making it ideal for precision DC and low-frequency signal acquisition. Within the broader signal-chain taxonomy, Sigma-Delta ADCs sit at the top of the resolution hierarchy among integrated ADC architectures, alongside successive-approximation (SAR) ADCs and pipeline ADCs; the AD7719 belongs to the precision-converter family within Analog Devices' data-converter portfolio.
Key specifications from the manufacturer datasheet include 16/24-bit resolution on the dual Σ-Δ channels, an input range from REFIN1/128 to REFIN1 (fully differential, unipolar and bipolar), single 3 V and 5 V supply operation, 1.5 mA typical normal-mode quiescent current at 3 V, and 10 µA power-down current (32 kHz crystal running). The main channel accepts fully differential, unipolar, and bipolar input ranges via the on-chip PGA, and signals can be routed from either channel to calibration registers for background gain and offset correction.
Architecturally, the AD7719 uses Analog Devices' proven Σ-Δ modulation core with a digital filter that delivers effective resolution at update rates suited for industrial sensors. The part communicates through an SPI-, QSPI-, MICROWIRE-, or DSP-compatible serial interface and is factory-trimmed to minimize external components.
Typical applications include weigh scales, pressure and temperature sensor measurement, portable instrumentation, factory process control, and 4-20 mA loop transmitters. The integrated current sources and low-side switches simplify bridge-sensor excitation, while the auxiliary ADC can monitor supply voltage or temperature simultaneously with the main measurement.
When designing with this AFE, place decoupling capacitors as close as possible to the analog and digital supply pins and isolate the analog and digital grounds at a single point. The digital filter settling time must be allowed between conversions to ensure specified noise performance.
This page combines distributor pricing as of 2026-10-12, drop-in alternative cross-references, and PCB-level design notes that go beyond the manufacturer datasheet to accelerate component selection.
Drop-in alternatives for AD7719BR-REEL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7719BR-REEL7 (same form factor and footprint) — differing in Number of Channels, Package, Packaging, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7719BR-REEL
✅ Drop-In✓ In Stock
$10.55 / Unit
View Datasheet →AD7719BRZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7719BRZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7707BRZ-REEL
✅ Drop-In✓ In Stock
$9.4 / Unit
View Datasheet →AD7719BR-REEL7 Maximum Ratings & Electrical Characteristics
| Resolution | 16/24-bit (dual channel) |
| Number of ADCs | 2 (Sigma-Delta) |
| Number of Input Channels | 3 or 6 |
| Data Interface | DSP, MICROWIRE, QSPI, Serial, SPI |
| Input Signal Range | REFIN1/128 to REFIN1 (differential, unipolar, bipolar) |
| Supply Voltage | 3 V to 5 V (single supply) |
| Normal Supply Current | 1.5 mA typ @ 3 V |
| Power-Down Current | 10 µA (32 kHz crystal running) |
| Operating Temperature | -40°C to +85°C |
| Package | 28-SOIC (0.295", 7.50mm width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR), 7-inch |
| On-chip Features | PGA, excitation current sources, low-side switches, digital I/O, temperature sensor |
| Architecture | Sigma-Delta |
| RoHS Status | Compliant |
AD7719BR-REEL7 Pin Configuration
| Pin 1 | REFIN1+ — Positive reference input 1 |
| Pin 2 | REFIN1- — Negative reference input 1 |
| Pin 3 | AIN1 — Analog input 1 |
| Pin 4 | AIN2 — Analog input 2 |
| Pin 5 | AIN3 — Analog input 3 |
| Pin 6 | AIN4 — Analog input 4 |
| Pin 7 | AIN5 — Analog input 5 |
| Pin 8 | AIN6 — Analog input 6 |
| Pin 9 | IOUT1 — Excitation current source output 1 |
| Pin 10 | IOUT2 — Excitation current source output 2 |
| Pin 11 | SW1 — Low-side power switch 1 |
| Pin 12 | SW2 — Low-side power switch 2 |
| Pin 13 | GND — Ground |
| Pin 14 | AVDD — Analog supply voltage |
| Pin 15 | DVDD — Digital supply voltage |
| Pin 16 | GND — Digital ground |
| Pin 17 | DOUT — Serial data output |
| Pin 18 | DIN — Serial data input |
| Pin 19 | SCLK — Serial clock input |
| Pin 20 | CS — Chip select (active low) |
| Pin 21 | DRDY — Data ready output (active low) |
| Pin 22 | IO1 — Digital I/O pin 1 |
| Pin 23 | IO2 — Digital I/O pin 2 |
| Pin 24 | XTALIN — Crystal oscillator input (32.768 kHz) |
| Pin 25 | XTALOUT — Crystal oscillator output |
| Pin 26 | REFIN2+ — Positive reference input 2 (auxiliary ADC) |
| Pin 27 | REFIN2- — Negative reference input 2 (auxiliary ADC) |
| Pin 28 | AVDD — Analog supply voltage (redundant) |
Typical Applications
AD7719BR-REEL7 is suitable for 6 applications: Weigh Scale Front-End, Industrial Pressure Transmitter, Temperature Measurement and Logging, Portable Weighing and Field Instrumentation, Factory Process Control and PLC Analog Input Modules, Sensor Measurement and Signal Conditioning.
Weigh Scale Front-End
The AD7719BR-REEL7 is purpose-built for weigh scales through its integration of a 24-bit main Sigma-Delta ADC, switchable matched excitation current sources, and low-side power switches in one 28-SOIC device. The excitation sources drive a load-cell bridge directly without external constant-current circuitry, while the low-side switches eliminate the need for discrete MOSFETs to power-gauge the bridge. With PGA gains from 1 to 128 and an effective resolution suitable for legal-for-trade scales, the AD7719BR-REEL7 simplifies the analog signal chain for 4-wire and 6-wire load-cell designs. Power-down current of 10 µA enables battery-powered portable scales to extend operating life.
Recommended
Industrial Pressure Transmitter
In 4-20 mA loop-powered pressure transmitters, the AD7719BR-REEL7 simultaneously digitizes the bridge pressure signal through its main 24-bit ADC while the auxiliary 16/24-bit channel monitors die temperature with the on-chip sensor for real-time compensation. The fully differential, bipolar input ranges from REFIN1/128 to REFIN1 accept millivolt-level bridge outputs directly through the on-chip PGA. The 1.5 mA normal quiescent current leaves adequate loop budget for the 4 mA minimum operating current mandated by HART and 4-20 mA transmitter standards. Combined with the SPI-compatible serial interface, the part hosts easily in low-cost microcontroller-based smart transmitters.
Recommended
Temperature Measurement and Logging
The AD7719BR-REEL7 dual-ADC architecture supports simultaneous thermocouple/RTD measurement and cold-junction compensation in industrial temperature loggers. The main 24-bit channel digitizes the thermocouple or RTD signal through the on-chip PGA while the auxiliary channel reads the on-chip temperature sensor or external diode for cold-junction compensation. The wide PGA input range (REFIN1/128 to REFIN1) accepts low-level signals from RTDs and thermocouples directly without pre-amplification. SPI-compatible serial interface and deep 10 µA power-down current suit battery-powered temperature data loggers requiring multi-year lifetime.
Recommended
Portable Weighing and Field Instrumentation
Battery-powered portable instrumentation such as handheld scales, portable manometers, and field calibrators benefits from the AD7719BR-REEL7's combination of 1.5 mA typical current and 10 µA power-down current with 32 kHz crystal running. The dual ADC channels enable simultaneous measurement of the primary transducer signal and battery voltage monitoring through the on-chip temperature sensor functionality. The 28-SOIC package and low component count make the part attractive for compact handheld enclosures. Single 3 V or 5 V supply operation simplifies battery-management design.
Recommended
Factory Process Control and PLC Analog Input Modules
PLC analog input modules and process-control front-ends use the AD7719BR-REEL7 to digitize 4-20 mA, 0-10 V, and bridge-sensor signals in a single 28-SOIC footprint. The dual ADC channels digitize two analog inputs simultaneously, doubling module density compared to single-channel Sigma-Delta ADC solutions. The fully differential, bipolar input capability handles bipolar industrial signals without external signal conditioning. The on-chip digital filter and PGA together deliver the 50 Hz / 60 Hz power-line rejection needed for factory-floor noise immunity.
Recommended
Sensor Measurement and Signal Conditioning
The AD7719BR-REEL7 is a complete analog front-end for general sensor measurement applications requiring simultaneous multi-signal digitization. The three- or six-input analog multiplexer combined with on-chip PGA, dual Σ-Δ ADCs, and switchable excitation current sources handles strain gauges, load cells, RTDs, and general low-frequency analog sensors. Integrated low-side power switches can power-gate external sensors between measurements for low standby power. The on-chip temperature sensor provides auxiliary environmental data without additional hardware.
Recommended
Recommended Products Summary
Engineering reference data for AD7719BR-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7719BR-REEL | AD7719BRZ | AD7719BRZ-REEL | AD7707BRZ-REEL |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SOIC (0.295", 7.50mm) | 28-SOIC (0.295", 7.50mm) - same | 28-SOIC (0.295", 7.50mm) - same | 28-SOIC (0.295", 7.50mm) - same | 28-SOIC - similar |
| Resolution | 16/24-bit (dual channel) | 16/24-bit (dual channel) | 16/24-bit (dual channel) | 16/24-bit (dual channel) | 16-bit (single channel) |
| Number of ADCs | 2 (Sigma-Delta) | 2 (Sigma-Delta) | 2 (Sigma-Delta) | 2 (Sigma-Delta) | 1 (Sigma-Delta) |
| Supply Voltage | 3 V to 5 V | 3 V to 5 V | 3 V to 5 V | 3 V to 5 V | 3 V to 5 V |
| On-chip Excitation Current Sources | Yes (switchable, matched) | Yes | Yes | Yes | No |
| On-chip Temperature Sensor | Yes | Yes | Yes | Yes | No |
Key Differentiators
- Dual ADC integration with on-chip excitation sources (vs AD7707BRZ-REEL)
- Lead-free matte tin finish option (vs AD7719BR-REEL)
- Reel quantity optimization (vs AD7719BRZ-REEL)
Design Notes
Decouple AVDD and DVDD independently with a 10 µF tantalum plus 0.1 µF ceramic bypass capacitor placed within 50 mm of the supply pins. The AD7719BR-REEL7's 10 µA power-down current (with 32.768 kHz crystal running) requires that the host controller drive the CS pin high to enter power-down; otherwise the device remains in normal mode consuming 1.5 mA at 3 V. For battery-powered designs, gate the DVDD supply through a load switch to achieve the 1 µA deep-sleep state defined in the datasheet.
Place the reference bypass capacitor (10 µF / 0.1 µF ceramic) directly at the REFIN1+ and REFIN1- pins to minimize reference-noise coupling into the Σ-Δ modulator. Route the AVDD and DVDD traces as separate power planes separated by a ferrite bead or 10 Ω resistor to prevent digital switching noise from corrupting the analog supply. Use a single ground plane under the analog inputs and star-connect the analog ground return to the MCU ground at one point only.
Keep the SCLK, DIN, DOUT, and DRDY traces away from the AIN1-AIN6 input traces to avoid digital-to-analog crosstalk. The Σ-Δ modulator's digital filter settles in 3 conversions (single-cycle mode) or in the programmed -3 dB word length (continuous mode); designers must wait the full settling time before reading the conversion register. When using the 32.768 kHz crystal directly across XTALIN and XTALOUT, place the load capacitors within 5 mm of the pins and isolate them from noisy digital traces.
Ensure the REFIN1 pins never float - left floating, the input multiplexer can be biased to undefined states and cause the modulator to output all-ones or all-zeros. Always include a 1 nF ceramic bypass across REFIN1+ and REFIN1- even when using an external precision reference, to filter broadband reference noise. When using the on-chip excitation current sources (IOUT1/IOUT2) to drive a bridge sensor, do not exceed the 10 mA maximum current rating per source or the part may permanently damage.
Compliance Information
RoHS compliant per DigiKey listing. AEC-Q100 automotive qualification not applicable - this is an industrial-grade precision converter. Halogen-free status not explicitly stated in verified web data.
